I have done a few posts on Mercury (Click on the "Mercury" Label, or here). Here's the thing that engaged me even before new data started coming in: Mercury is pretty small, a bit larger than our moon. Yet it has a proportionally enormous iron core (the moon has no significant core, which is a good topic for another post). Because from Earth, Mercury is always close to the sun, it's very difficult to observe with traditional telescopes- and even when it's at its greatest angular distance from the sun, only a small crescent is illuminated from our perspective. In addition, through the oddities of orbital dynamics, it's much more difficult to get a probe to than one might first assume. So even though it's one of the closer planets, we know very little about Mercury.
And as I've tried to explain numerous times before, stuff we don't know is very, very appealing to me.
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